Compilare: user.cpp: In function ‘void solve3()’: user.cpp:82:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (all.size() < n) { ^ user.cpp:99:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < with_min[crt_min].size(); ++i) { ^ user.cpp:111:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < with_min[crt_min].size(); ++i) { ^ user.cpp: In function ‘void solve1()’: user.cpp:19:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &k, &c); ^ user.cpp:25:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x); ^ user.cpp: In function ‘void solve2()’: user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &k, &c); ^ user.cpp:52:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x); ^ user.cpp: In function ‘void solve3()’: user.cpp:79:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &k, &c); ^ user.cpp: In function ‘int main()’: user.cpp:132:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("procol.in", "r", stdin); ^ user.cpp:133:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("procol.out", "w", stdout); ^ user.cpp:136:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &type); ^